SAS Rogue Heroes true story: How much of the drama really happened?

The new season once again stars Jack O'Connell and Connor Swindells in central roles, while new cast members for the second run include Con O'Neill and Gwilym Lee, the latter of whom plays the brother of Swindells's character.

But how much of SAS Rogue Heroes is based on real British history? Read on for everything you need to know.

SAS Rogue Heroes true story: Is the BBC drama based on a book?

SAS Rogue Heroes is based on the 2017 Ben Macintyre book Rogue Heroes: The History of the SAS, Britain's Secret Special Forces Unit That Sabotaged the Nazis and Changed the Nature of War. The book has since been retitled SAS Rogue Heroes to align with the series.

The show's creator Steven Knight spoke about drawing from the book for the show, admitting that he did have to make some changes.

He said: "To create a drama from this amazing story, I had to sculpt a world where things are a little bit heightened, much like how war and the absurdity of it heightens every emotion."

However, he also said that "bringing characters to life to inhabit this world, especially ones that are not archetypical heroes, was made so much easier by leaning on the facts and the truths".

Are the characters in SAS Rogue Heroes real people?

The majority of the characters in SAS Rogue Heroes are based on real people – Paddy Mayne, David Stirling, Bill Stirling, Reg Seekings, John Tonkin, Dudley Clarke and more were all real.

One major character who has been created specifically for the series is Eve Mansour, the Deputy Head of French intelligence in Cairo played by Sofia Boutella.

Boutella said of the character: "Even if Eve is a fictional character in comparison to David Stirling or Paddy Mayne, she is very much a character that existed at the time. There were spies like Noor Inayat Khan or Virginia Hall.

"So many incredible women who were a part of the liberation during the Second World War. Eve, like a lot of them, used methods that were born within her instinct and her intelligence."

Boutella continued: "Considering their backgrounds, a lot of men at the time had all these pre-made ideas about the capacities of women like Noor Inayat Khan or Virginia Hall.

"My character also uses her background and her physical aspect in order to lure people, in order to get what she needs to free the exiled Free French government and North Africa from the Nazis."

How closely does SAS Rogue Heroes stick to reality?

As with all series based on true stories, some adjustments have had to be made for the real history to be brought to TV. However, the team behind SAS Rogue Heroes has stressed that they have tried, where possible, to stick to the reality of what happened.

When asked about the series' authenticity to real history at an event for the show's first season, attended by RadioTimes.com and other press, executive producer Karen Wilson said: "We have taken that very seriously. We have been in touch with all the surviving members of the families and we have tried to do everything as authentically as possible.

"We sought the advice of the SAS Regimental Association, who were super supportive throughout the process. We can only use the information that we've got, but I think with Ben's book, with the research that Steve's done with the team, and the way they approached authenticity, just the costumes, they were, as much as possible, authentic World War II costumes."

Meanwhile, creator Steven Knight said: "It's such an amazing, unbelievable, incredible story. We all think we know who they are but when I read the Ben Macintyre book and started researching around, what gets me is how young they were, like 19, 20, 22, 23-year-old boys that were in this incredible pressure cooker situation.

"And they just decided among themselves to do something different. And it's just amazing. They changed the course of the battle."

Knight revealed that the team tried to keep the series "real" and this meant dramatising the unit's failures as well as their successes.

He said: "In the book, there’s lots of failure and disaster. And characters who, as a dramatist, you would love to keep going and so you make a choice. And so I’ve chosen that when that character dies, they die and it's a shock. And hopefully will be quite emotionally affecting. The choice has always been for me keeping to the real story in terms of the tempo.

"Through the writing I tried not to refer to other fiction, and tried where possible to refer to first hand accounts. I think there’s a sort of smoothness about fiction about war, but everything I've learned from people who have experienced it is it's just chaos.

"Individuals can take control of a few moments and that changes everything. So I tried where it was possible to refer more to first hand accounts rather than fiction."

At a Q&A for season 2, Knight said of the adaptation process that any changes made are "mostly putting things in a different chronological order."

He continued: "What it is is most often, the thing that really happened is so weird and so bizarre – this is true – that you think the audience either wouldn't go with it, or they would lose empathy with the character.

"The example I would give in series 1 is we see David Sterling throw a fake hand grenade onto a snooker table in order to get the table. In reality it was a real hand grenade. And you just think, 'nobody would believe that'. So that's the thing, you’re sort of almost contracting the reality.”

• Read More: SAS Rogue Heroes cast: Full list of actors and characters
• Read More: SAS Rogue Heroes soundtrack: Every song featured in the drama
• Read More: SAS Rogue Heroes season 2 review: Rollicking war drama's return is delightfully imperfect
• Read More: SAS Rogue Heroes boss reveals dramatic real-life story behind grenade scene

SAS Rogue Heroes season 2 will air at 9pm on New Year's Day on BBC One and BBC iPlayer, while season 1 is available on BBC iPlayer now.

If you're looking for something else to watch, visit our TV Guide or take a look at the rest of our Drama coverage. For more from the biggest stars in TV, listen to The Radio Times Podcast.